Merge branch 'MyIgel-rebuild-psr7'

21 files changed, 1284 insertions, 6 deletions

diff --git a/tests/Unit/ApplicationTest.php b/tests/Unit/ApplicationTest.php
index f58483ea..866eb957 100644
--- a/tests/Unit/ApplicationTest.php
+++ b/tests/Unit/ApplicationTest.php
@@ -9,6 +9,7 @@ use Engelsystem\Container\ServiceProvider;
 use PHPUnit\Framework\TestCase;
 use PHPUnit_Framework_MockObject_MockObject;
 use Psr\Container\ContainerInterface;
+use Psr\Http\Server\MiddlewareInterface;
 use ReflectionClass;
 
 class ApplicationTest extends TestCase
@@ -118,6 +119,7 @@ class ApplicationTest extends TestCase
     /**
      * @covers \Engelsystem\Application::bootstrap
      * @covers \Engelsystem\Application::isBooted
+     * @covers \Engelsystem\Application::getMiddleware
      */
     public function testBootstrap()
     {
@@ -137,10 +139,11 @@ class ApplicationTest extends TestCase
         $config = $this->getMockBuilder(Config::class)
             ->getMock();
 
-        $config->expects($this->once())
+        $middleware = [MiddlewareInterface::class];
+        $config->expects($this->exactly(2))
             ->method('get')
-            ->with('providers')
-            ->willReturn([$serviceProvider]);
+            ->withConsecutive(['providers'], ['middleware'])
+            ->willReturnOnConsecutiveCalls([$serviceProvider], $middleware);
 
         $property = (new ReflectionClass($app))->getProperty('serviceProviders');
         $property->setAccessible(true);
@@ -149,6 +152,7 @@ class ApplicationTest extends TestCase
         $app->bootstrap($config);
 
         $this->assertTrue($app->isBooted());
+        $this->assertEquals($middleware, $app->getMiddleware());
 
         // Run bootstrap another time to ensure that providers are registered only once
         $app->bootstrap($config);
diff --git a/tests/Unit/Exceptions/HandlerTest.php b/tests/Unit/Exceptions/HandlerTest.php
index 5a6ffe16..58d25de3 100644
--- a/tests/Unit/Exceptions/HandlerTest.php
+++ b/tests/Unit/Exceptions/HandlerTest.php
@@ -49,15 +49,19 @@ class HandlerTest extends TestCase
     public function testExceptionHandler()
     {
         $exception = new Exception();
+        $errorMessage = 'Oh noes, an error!';
 
         /** @var HandlerInterface|Mock $handlerMock */
         $handlerMock = $this->getMockForAbstractClass(HandlerInterface::class);
-        $handlerMock->expects($this->once())
+        $handlerMock->expects($this->atLeastOnce())
             ->method('report')
             ->with($exception);
-        $handlerMock->expects($this->once())
+        $handlerMock->expects($this->atLeastOnce())
             ->method('render')
-            ->with($this->isInstanceOf(Request::class), $exception);
+            ->with($this->isInstanceOf(Request::class), $exception)
+            ->willReturnCallback(function () use ($errorMessage) {
+                echo $errorMessage;
+            });
 
         /** @var Handler|Mock $handler */
         $handler = $this->getMockBuilder(Handler::class)
@@ -68,7 +72,11 @@ class HandlerTest extends TestCase
 
         $handler->setHandler(Handler::ENV_PRODUCTION, $handlerMock);
 
+        $this->expectOutputString($errorMessage);
         $handler->exceptionHandler($exception);
+
+        $return = $handler->exceptionHandler($exception, true);
+        $this->assertEquals($errorMessage, $return);
     }
 
     /**
diff --git a/tests/Unit/Exceptions/Handlers/WhoopsTest.php b/tests/Unit/Exceptions/Handlers/WhoopsTest.php
index 261ee83f..4062979b 100644
--- a/tests/Unit/Exceptions/Handlers/WhoopsTest.php
+++ b/tests/Unit/Exceptions/Handlers/WhoopsTest.php
@@ -74,6 +74,14 @@ class WhoopsTest extends TestCase
             );
         $whoopsRunner
             ->expects($this->once())
+            ->method('writeToOutput')
+            ->with(false);
+        $whoopsRunner
+            ->expects($this->once())
+            ->method('allowQuit')
+            ->with(false);
+        $whoopsRunner
+            ->expects($this->once())
             ->method('handleException')
             ->with($exception);
 
diff --git a/tests/Unit/HelpersTest.php b/tests/Unit/HelpersTest.php
index 9514ad8c..cd001df9 100644
--- a/tests/Unit/HelpersTest.php
+++ b/tests/Unit/HelpersTest.php
@@ -6,6 +6,7 @@ use Engelsystem\Application;
 use Engelsystem\Config\Config;
 use Engelsystem\Container\Container;
 use Engelsystem\Http\Request;
+use Engelsystem\Http\Response;
 use Engelsystem\Renderer\Renderer;
 use Engelsystem\Routing\UrlGeneratorInterface;
 use PHPUnit\Framework\TestCase;
@@ -127,6 +128,33 @@ class HelpersTest extends TestCase
     }
 
     /**
+     * @covers \response
+     */
+    public function testResponse()
+    {
+        /** @var MockObject|Response $response */
+        $response = $this->getMockBuilder(Response::class)->getMock();
+        $this->getAppMock('psr7.response', $response);
+
+        $response->expects($this->once())
+            ->method('withContent')
+            ->with('Lorem Ipsum?')
+            ->willReturn($response);
+
+        $response->expects($this->once())
+            ->method('withStatus')
+            ->with(501)
+            ->willReturn($response);
+
+        $response->expects($this->exactly(2))
+            ->method('withAddedHeader')
+            ->withConsecutive(['lor', 'em'], ['foo', 'bar'])
+            ->willReturn($response);
+
+        $this->assertEquals($response, response('Lorem Ipsum?', 501, ['lor' => 'em', 'foo' => 'bar',]));
+    }
+
+    /**
      * @covers \session
      */
     public function testSession()
diff --git a/tests/Unit/Http/MessageTraitRequestTest.php b/tests/Unit/Http/MessageTraitRequestTest.php
new file mode 100644
index 00000000..7430b5d7
--- /dev/null
+++ b/tests/Unit/Http/MessageTraitRequestTest.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Http;
+
+use Engelsystem\Test\Unit\Http\Stub\MessageTraitRequestImplementation;
+use PHPUnit\Framework\TestCase;
+use Zend\Diactoros\Stream;
+
+class MessageTraitRequestTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::withProtocolVersion
+     */
+    public function testWithProtocolVersion()
+    {
+        $message = new MessageTraitRequestImplementation();
+        $newMessage = $message->withProtocolVersion('0.1');
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertEquals('0.1', $newMessage->getProtocolVersion());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::getHeaders
+     */
+    public function testGetHeaders()
+    {
+        $message = new MessageTraitRequestImplementation();
+        $newMessage = $message->withHeader('lorem', 'ipsum');
+
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertArraySubset(['lorem' => ['ipsum']], $newMessage->getHeaders());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::withBody
+     */
+    public function testWithBody()
+    {
+        /** @var Stream $stream */
+        $stream = new Stream('php://memory', 'wb+');
+        $stream->write('Test content');
+        $stream->rewind();
+
+        $message = new MessageTraitRequestImplementation();
+        $newMessage = $message->withBody($stream);
+
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertEquals('Test content', $newMessage->getContent());
+    }
+}
diff --git a/tests/Unit/Http/MessageTraitResponseTest.php b/tests/Unit/Http/MessageTraitResponseTest.php
new file mode 100644
index 00000000..f60360a3
--- /dev/null
+++ b/tests/Unit/Http/MessageTraitResponseTest.php
@@ -0,0 +1,159 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Http;
+
+use Engelsystem\Test\Unit\Http\Stub\MessageTraitResponseImplementation;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\MessageInterface;
+use Psr\Http\Message\StreamInterface;
+use Symfony\Component\HttpFoundation\Response as SymfonyResponse;
+use Zend\Diactoros\Stream;
+
+class MessageTraitResponseTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Http\MessageTrait
+     */
+    public function testCreate()
+    {
+        $message = new MessageTraitResponseImplementation();
+        $this->assertInstanceOf(MessageInterface::class, $message);
+        $this->assertInstanceOf(SymfonyResponse::class, $message);
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::getProtocolVersion
+     * @covers \Engelsystem\Http\MessageTrait::withProtocolVersion
+     */
+    public function testGetProtocolVersion()
+    {
+        $message = new MessageTraitResponseImplementation();
+        $newMessage = $message->withProtocolVersion('0.1');
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertEquals('0.1', $newMessage->getProtocolVersion());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::getHeaders
+     */
+    public function testGetHeaders()
+    {
+        $message = new MessageTraitResponseImplementation();
+        $newMessage = $message->withHeader('Foo', 'bar');
+
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertArraySubset(['Foo' => ['bar']], $newMessage->getHeaders());
+
+        $newMessage = $message->withHeader('lorem', ['ipsum', 'dolor']);
+        $this->assertArraySubset(['lorem' => ['ipsum', 'dolor']], $newMessage->getHeaders());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::hasHeader
+     */
+    public function testHasHeader()
+    {
+        $message = new MessageTraitResponseImplementation();
+        $this->assertFalse($message->hasHeader('test'));
+
+        $newMessage = $message->withHeader('test', '12345');
+        $this->assertTrue($newMessage->hasHeader('Test'));
+        $this->assertTrue($newMessage->hasHeader('test'));
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::getHeader
+     */
+    public function testGetHeader()
+    {
+        $message = new MessageTraitResponseImplementation();
+        $newMessage = $message->withHeader('foo', 'bar');
+
+        $this->assertEquals(['bar'], $newMessage->getHeader('Foo'));
+        $this->assertEquals([], $newMessage->getHeader('LoremIpsum'));
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::getHeaderLine
+     */
+    public function testGetHeaderLine()
+    {
+        $message = new MessageTraitResponseImplementation();
+        $newMessage = $message->withHeader('foo', ['bar', 'bla']);
+
+        $this->assertEquals('', $newMessage->getHeaderLine('Lorem-Ipsum'));
+        $this->assertEquals('bar,bla', $newMessage->getHeaderLine('Foo'));
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::withHeader
+     */
+    public function testWithHeader()
+    {
+        $message = new MessageTraitResponseImplementation();
+        $newMessage = $message->withHeader('foo', 'bar');
+
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertArraySubset(['foo' => ['bar']], $newMessage->getHeaders());
+
+        $newMessage = $newMessage->withHeader('Foo', ['lorem', 'ipsum']);
+        $this->assertArraySubset(['Foo' => ['lorem', 'ipsum']], $newMessage->getHeaders());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::withAddedHeader
+     */
+    public function testWithAddedHeader()
+    {
+        $message = new MessageTraitResponseImplementation();
+        $newMessage = $message->withHeader('foo', 'bar');
+
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertArraySubset(['foo' => ['bar']], $newMessage->getHeaders());
+
+        $newMessage = $newMessage->withAddedHeader('Foo', ['lorem', 'ipsum']);
+        $this->assertArraySubset(['Foo' => ['bar', 'lorem', 'ipsum']], $newMessage->getHeaders());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::withoutHeader
+     */
+    public function testWithoutHeader()
+    {
+        $message = (new MessageTraitResponseImplementation())->withHeader('foo', 'bar');
+        $this->assertTrue($message->hasHeader('foo'));
+
+        $newMessage = $message->withoutHeader('Foo');
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertFalse($newMessage->hasHeader('foo'));
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::getBody
+     */
+    public function testGetBody()
+    {
+        $message = (new MessageTraitResponseImplementation())->setContent('Foo bar!');
+        $body = $message->getBody();
+
+        $this->assertInstanceOf(StreamInterface::class, $body);
+        $this->assertEquals('Foo bar!', $body->getContents());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\MessageTrait::withBody
+     */
+    public function testWithBody()
+    {
+        /** @var Stream $stream */
+        $stream = new Stream('php://memory', 'wb+');
+        $stream->write('Test content');
+        $stream->rewind();
+
+        $message = new MessageTraitResponseImplementation();
+        $newMessage = $message->withBody($stream);
+
+        $this->assertNotEquals($message, $newMessage);
+        $this->assertEquals('Test content', $newMessage->getContent());
+    }
+}
diff --git a/tests/Unit/Http/Psr7ServiceProviderTest.php b/tests/Unit/Http/Psr7ServiceProviderTest.php
new file mode 100644
index 00000000..e14daf2a
--- /dev/null
+++ b/tests/Unit/Http/Psr7ServiceProviderTest.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Http;
+
+use Engelsystem\Http\Psr7ServiceProvider;
+use Engelsystem\Http\Request;
+use Engelsystem\Http\Response;
+use Engelsystem\Test\Unit\ServiceProviderTest;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface as RequestInterface;
+use Symfony\Bridge\PsrHttpMessage\Factory\DiactorosFactory;
+
+class Psr7ServiceProviderTest extends ServiceProviderTest
+{
+    /**
+     * @covers \Engelsystem\Http\Psr7ServiceProvider::register()
+     */
+    public function testRegister()
+    {
+        /** @var MockObject|DiactorosFactory $psr7Factory */
+        $psr7Factory = $this->createMock(DiactorosFactory::class);
+        /** @var MockObject|Request $request */
+        $request = $this->createMock(Request::class);
+        /** @var MockObject|Response $response */
+        $response = $this->createMock(Response::class);
+        /** @var MockObject|RequestInterface $psr7request */
+        $psr7request = $this->createMock(Request::class);
+        /** @var MockObject|ResponseInterface $psr7response */
+        $psr7response = $this->createMock(Response::class);
+
+        $app = $this->getApp(['make', 'instance', 'get', 'bind']);
+        $this->setExpects($app, 'make', [DiactorosFactory::class], $psr7Factory);
+
+        $app->expects($this->atLeastOnce())
+            ->method('get')
+            ->withConsecutive(['request'], ['response'])
+            ->willReturnOnConsecutiveCalls($request, $response);
+        $app->expects($this->atLeastOnce())
+            ->method('instance')
+            ->withConsecutive(
+                ['psr7.factory', $psr7Factory],
+                ['psr7.request', $psr7request],
+                ['psr7.response', $psr7response]
+            );
+        $app->expects($this->atLeastOnce())
+            ->method('bind')
+            ->withConsecutive(
+                [RequestInterface::class, 'psr7.request'],
+                [ResponseInterface::class, 'psr7.response']
+            );
+
+        $serviceProvider = new Psr7ServiceProvider($app);
+        $serviceProvider->register();
+    }
+}
diff --git a/tests/Unit/Http/RequestTest.php b/tests/Unit/Http/RequestTest.php
index a68f8b8f..916aac35 100644
--- a/tests/Unit/Http/RequestTest.php
+++ b/tests/Unit/Http/RequestTest.php
@@ -5,10 +5,25 @@ namespace Engelsystem\Test\Unit\Http;
 use Engelsystem\Http\Request;
 use PHPUnit\Framework\TestCase;
 use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\UploadedFileInterface;
+use Psr\Http\Message\UriInterface;
+use Symfony\Component\HttpFoundation\File\UploadedFile as SymfonyFile;
+use Symfony\Component\HttpFoundation\Request as SymfonyRequest;
 
 class RequestTest extends TestCase
 {
     /**
+     * @covers \Engelsystem\Http\Request
+     */
+    public function testCreate()
+    {
+        $response = new Request();
+        $this->assertInstanceOf(SymfonyRequest::class, $response);
+        $this->assertInstanceOf(RequestInterface::class, $response);
+    }
+
+    /**
      * @covers \Engelsystem\Http\Request::postData
      */
     public function testPostData()
@@ -96,4 +111,272 @@ class RequestTest extends TestCase
         $this->assertEquals('http://foo.bar/bla/foo', $request->url());
         $this->assertEquals('https://lorem.ipsum/dolor/sit', $request->url());
     }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getRequestTarget
+     */
+    public function testGetRequestTarget()
+    {
+        /** @var Request|MockObject $request */
+        $request = $this
+            ->getMockBuilder(Request::class)
+            ->setMethods(['getQueryString', 'path'])
+            ->getMock();
+
+        $request->expects($this->exactly(2))
+            ->method('getQueryString')
+            ->willReturnOnConsecutiveCalls(null, 'foo=bar&lorem=ipsum');
+        $request->expects($this->exactly(2))
+            ->method('path')
+            ->willReturn('foo/bar');
+
+        $this->assertEquals('/foo/bar', $request->getRequestTarget());
+        $this->assertEquals('/foo/bar?foo=bar&lorem=ipsum', $request->getRequestTarget());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withRequestTarget
+     */
+    public function testWithRequestTarget()
+    {
+        $request = new Request();
+        foreach (
+            [
+                '*',
+                '/foo/bar',
+                'https://lorem.ipsum/test?lor=em'
+            ] as $target
+        ) {
+            $new = $request->withRequestTarget($target);
+            $this->assertNotEquals($request, $new);
+        }
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withMethod
+     */
+    public function testWithMethod()
+    {
+        $request = new Request();
+
+        $new = $request->withMethod('PUT');
+
+        $this->assertNotEquals($request, $new);
+        $this->assertEquals('PUT', $new->getMethod());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withUri
+     */
+    public function testWithUri()
+    {
+        /** @var UriInterface|MockObject $uri */
+        $uri = $this->getMockForAbstractClass(UriInterface::class);
+
+        $uri->expects($this->atLeastOnce())
+            ->method('__toString')
+            ->willReturn('http://foo.bar/bla?foo=bar');
+
+        $request = Request::create('http://lor.em/');
+
+        $new = $request->withUri($uri);
+        $this->assertNotEquals($request, $new);
+        $this->assertEquals('http://foo.bar/bla?foo=bar', (string)$new->getUri());
+
+        $new = $request->withUri($uri, true);
+        $this->assertEquals('http://lor.em/bla?foo=bar', (string)$new->getUri());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getUri
+     */
+    public function testGetUri()
+    {
+        $request = Request::create('http://lor.em/test?bla=foo');
+
+        $uri = $request->getUri();
+        $this->assertInstanceOf(UriInterface::class, $uri);
+        $this->assertEquals('http://lor.em/test?bla=foo', (string)$uri);
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getServerParams
+     */
+    public function testGetServerParams()
+    {
+        $server = ['foo' => 'bar'];
+        $request = new Request([], [], [], [], [], $server);
+
+        $this->assertEquals($server, $request->getServerParams());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getCookieParams
+     */
+    public function testGetCookieParams()
+    {
+        $cookies = ['session' => 'LoremIpsumDolorSit'];
+        $request = new Request([], [], [], $cookies);
+
+        $this->assertEquals($cookies, $request->getCookieParams());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withCookieParams
+     */
+    public function testWithCookieParams()
+    {
+        $cookies = ['lor' => 'em'];
+        $request = new Request();
+
+        $new = $request->withCookieParams($cookies);
+
+        $this->assertNotEquals($request, $new);
+        $this->assertEquals($cookies, $new->getCookieParams());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getQueryParams
+     */
+    public function testGetQueryParams()
+    {
+        $params = ['foo' => 'baz'];
+        $request = new Request($params);
+
+        $this->assertEquals($params, $request->getQueryParams());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withQueryParams
+     */
+    public function testWithQueryParams()
+    {
+        $params = ['test' => 'ing'];
+        $request = new Request();
+
+        $new = $request->withQueryParams($params);
+
+        $this->assertNotEquals($request, $new);
+        $this->assertEquals($params, $new->getQueryParams());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getUploadedFiles
+     */
+    public function testGetUploadedFiles()
+    {
+        $filename = tempnam(sys_get_temp_dir(), 'test');
+        file_put_contents($filename, 'LoremIpsum!');
+        $files = [new SymfonyFile($filename, 'foo.html', 'text/html', 11)];
+        $request = new Request([], [], [], [], $files);
+
+        $uploadedFiles = $request->getUploadedFiles();
+        $this->assertNotEmpty($uploadedFiles);
+
+        /** @var UploadedFileInterface $file */
+        $file = $uploadedFiles[0];
+        $this->assertInstanceOf(UploadedFileInterface::class, $file);
+        $this->assertEquals('foo.html', $file->getClientFilename());
+        $this->assertEquals('text/html', $file->getClientMediaType());
+        $this->assertEquals(11, $file->getSize());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withUploadedFiles
+     */
+    public function testWithUploadedFiles()
+    {
+        $filename = tempnam(sys_get_temp_dir(), 'test');
+        file_put_contents($filename, 'LoremIpsum!');
+        $file = new \Zend\Diactoros\UploadedFile($filename, 11, UPLOAD_ERR_OK, 'test.txt', 'text/plain');
+
+        $request = new Request();
+        $new = $request->withUploadedFiles([$file]);
+        $uploadedFiles = $new->getUploadedFiles();
+        $this->assertNotEquals($request, $new);
+        $this->assertNotEmpty($uploadedFiles);
+
+        /** @var UploadedFileInterface $file */
+        $file = $uploadedFiles[0];
+        $this->assertEquals('test.txt', $file->getClientFilename());
+        $this->assertEquals('text/plain', $file->getClientMediaType());
+        $this->assertEquals(11, $file->getSize());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getParsedBody
+     */
+    public function testGetParsedBody()
+    {
+        $body = ['foo' => 'lorem'];
+        $request = new Request();
+        $request->request->add($body);
+
+        $this->assertEquals($body, $request->getParsedBody());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withParsedBody
+     */
+    public function testWithParsedBody()
+    {
+        $data = ['test' => 'er'];
+        $request = new Request();
+
+        $new = $request->withParsedBody($data);
+
+        $this->assertNotEquals($request, $new);
+        $this->assertEquals($data, $new->getParsedBody());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getAttributes
+     */
+    public function testGetAttributes()
+    {
+        $attributes = ['foo' => 'lorem', 'ipsum' => 'dolor'];
+        $request = new Request([], [], $attributes);
+
+        $this->assertEquals($attributes, $request->getAttributes());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::getAttribute
+     */
+    public function testGetAttribute()
+    {
+        $attributes = ['foo' => 'lorem', 'ipsum' => 'dolor'];
+        $request = new Request([], [], $attributes);
+
+        $this->assertEquals($attributes['ipsum'], $request->getAttribute('ipsum'));
+        $this->assertEquals(null, $request->getAttribute('dolor'));
+        $this->assertEquals(1234, $request->getAttribute('test', 1234));
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withAttribute
+     */
+    public function testWithAttribute()
+    {
+        $request = new Request();
+
+        $new = $request->withAttribute('lorem', 'ipsum');
+
+        $this->assertNotEquals($request, $new);
+        $this->assertEquals('ipsum', $new->getAttribute('lorem'));
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Request::withoutAttribute
+     */
+    public function testWithoutAttribute()
+    {
+        $attributes = ['foo' => 'lorem', 'ipsum' => 'dolor'];
+        $request = new Request([], [], $attributes);
+
+        $new = $request->withoutAttribute('ipsum');
+
+        $this->assertNotEquals($request, $new);
+        $this->assertEquals(['foo' => 'lorem'], $new->getAttributes());
+    }
 }
diff --git a/tests/Unit/Http/ResponseServiceProviderTest.php b/tests/Unit/Http/ResponseServiceProviderTest.php
new file mode 100644
index 00000000..52e95714
--- /dev/null
+++ b/tests/Unit/Http/ResponseServiceProviderTest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Http;
+
+use Engelsystem\Http\Response;
+use Engelsystem\Http\ResponseServiceProvider;
+use Engelsystem\Test\Unit\ServiceProviderTest;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+
+class ResponseServiceProviderTest extends ServiceProviderTest
+{
+    /**
+     * @covers \Engelsystem\Http\ResponseServiceProvider::register()
+     */
+    public function testRegister()
+    {
+        /** @var MockObject|Response $response */
+        $response = $this->getMockBuilder(Response::class)
+            ->getMock();
+
+        $app = $this->getApp();
+
+        $this->setExpects($app, 'make', [Response::class], $response);
+        $this->setExpects($app, 'instance', ['response', $response]);
+
+        $serviceProvider = new ResponseServiceProvider($app);
+        $serviceProvider->register();
+    }
+}
diff --git a/tests/Unit/Http/ResponseTest.php b/tests/Unit/Http/ResponseTest.php
new file mode 100644
index 00000000..f6c24767
--- /dev/null
+++ b/tests/Unit/Http/ResponseTest.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Http;
+
+use Engelsystem\Http\Response;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\ResponseInterface;
+use Symfony\Component\HttpFoundation\Response as SymfonyResponse;
+
+class ResponseTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Http\Response
+     */
+    public function testCreate()
+    {
+        $response = new Response();
+        $this->assertInstanceOf(SymfonyResponse::class, $response);
+        $this->assertInstanceOf(ResponseInterface::class, $response);
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Response::withStatus
+     * @covers \Engelsystem\Http\Response::getReasonPhrase
+     */
+    public function testWithStatus()
+    {
+        $response = new Response();
+        $newResponse = $response->withStatus(503);
+        $this->assertNotEquals($response, $newResponse);
+        $this->assertNotEquals('', $newResponse->getReasonPhrase());
+        $this->assertEquals(503, $newResponse->getStatusCode());
+
+        $newResponse = $response->withStatus(503, 'Foo');
+        $this->assertEquals('Foo', $newResponse->getReasonPhrase());
+    }
+
+    /**
+     * @covers \Engelsystem\Http\Response::withContent
+     */
+    public function testWithContent()
+    {
+        $response = new Response();
+        $newResponse = $response->withContent('Lorem Ipsum?');
+
+        $this->assertNotEquals($response, $newResponse);
+        $this->assertEquals('Lorem Ipsum?', $newResponse->getContent());
+    }
+}
diff --git a/tests/Unit/Http/Stub/MessageTraitRequestImplementation.php b/tests/Unit/Http/Stub/MessageTraitRequestImplementation.php
new file mode 100644
index 00000000..04d08913
--- /dev/null
+++ b/tests/Unit/Http/Stub/MessageTraitRequestImplementation.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Http\Stub;
+
+use Engelsystem\Http\MessageTrait;
+use Psr\Http\Message\MessageInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+class MessageTraitRequestImplementation extends Request implements MessageInterface
+{
+    use MessageTrait;
+}
diff --git a/tests/Unit/Http/Stub/MessageTraitResponseImplementation.php b/tests/Unit/Http/Stub/MessageTraitResponseImplementation.php
new file mode 100644
index 00000000..2ec4b943
--- /dev/null
+++ b/tests/Unit/Http/Stub/MessageTraitResponseImplementation.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Http\Stub;
+
+use Engelsystem\Http\MessageTrait;
+use Psr\Http\Message\MessageInterface;
+use Symfony\Component\HttpFoundation\Response;
+
+class MessageTraitResponseImplementation extends Response implements MessageInterface
+{
+    use MessageTrait;
+}
diff --git a/tests/Unit/Middleware/DispatcherTest.php b/tests/Unit/Middleware/DispatcherTest.php
new file mode 100644
index 00000000..c01c5029
--- /dev/null
+++ b/tests/Unit/Middleware/DispatcherTest.php
@@ -0,0 +1,230 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware;
+
+use Engelsystem\Application;
+use Engelsystem\Middleware\Dispatcher;
+use Engelsystem\Test\Unit\Middleware\Stub\NotARealMiddleware;
+use Engelsystem\Test\Unit\Middleware\Stub\ReturnResponseMiddleware;
+use InvalidArgumentException;
+use LogicException;
+use PHPUnit\Framework\TestCase;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use ReflectionClass as Reflection;
+
+class DispatcherTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::__construct
+     */
+    public function testInit()
+    {
+        /** @var Application|MockObject $container */
+        $container = $this->createMock(Application::class);
+
+        $dispatcher = new Dispatcher([], $container);
+        $this->assertInstanceOf(MiddlewareInterface::class, $dispatcher);
+        $this->assertInstanceOf(RequestHandlerInterface::class, $dispatcher);
+
+        $reflection = new Reflection(get_class($dispatcher));
+        $property = $reflection->getProperty('container');
+        $property->setAccessible(true);
+        $this->assertEquals($container, $property->getValue($dispatcher));
+    }
+
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::process
+     */
+    public function testProcess()
+    {
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->createMock(ResponseInterface::class);
+        /** @var RequestHandlerInterface|MockObject $handler */
+        $handler = $this->createMock(RequestHandlerInterface::class);
+
+        /** @var Dispatcher|MockObject $dispatcher */
+        $dispatcher = $this->getMockBuilder(Dispatcher::class)
+            ->setMethods(['handle'])
+            ->getMock();
+
+        $dispatcher->expects($this->once())
+            ->method('handle')
+            ->willReturn($response);
+
+        $return = $dispatcher->process($request, $handler);
+        $this->assertEquals($response, $return);
+
+        $reflection = new Reflection(get_class($dispatcher));
+        $property = $reflection->getProperty('next');
+        $property->setAccessible(true);
+
+        $this->assertEquals($handler, $property->getValue($dispatcher));
+    }
+
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::handle
+     */
+    public function testHandle()
+    {
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->createMock(ResponseInterface::class);
+        /** @var MiddlewareInterface|MockObject $middleware */
+        $middleware = $this->createMock(MiddlewareInterface::class);
+
+        $dispatcher = new Dispatcher([$middleware]);
+        $middleware->expects($this->once())
+            ->method('process')
+            ->with($request, $dispatcher)
+            ->willReturn($response);
+
+        $return = $dispatcher->handle($request);
+        $this->assertEquals($response, $return);
+    }
+
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::handle
+     */
+    public function testHandleNext()
+    {
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->createMock(ResponseInterface::class);
+        /** @var RequestHandlerInterface|MockObject $handler */
+        $handler = $this->createMock(RequestHandlerInterface::class);
+
+        $dispatcher = new Dispatcher();
+        $handler->expects($this->once())
+            ->method('handle')
+            ->with($request)
+            ->willReturn($response);
+
+        $reflection = new Reflection(get_class($dispatcher));
+        $property = $reflection->getProperty('next');
+        $property->setAccessible(true);
+        $property->setValue($dispatcher, $handler);
+
+        $return = $dispatcher->handle($request);
+        $this->assertEquals($response, $return);
+    }
+
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::handle
+     */
+    public function testHandleNoMiddleware()
+    {
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+
+        $this->expectException(LogicException::class);
+
+        $dispatcher = new Dispatcher();
+        $dispatcher->handle($request);
+    }
+
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::handle
+     */
+    public function testHandleNoRealMiddleware()
+    {
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+
+        $this->expectException(InvalidArgumentException::class);
+
+        $dispatcher = new Dispatcher([new NotARealMiddleware()]);
+        $dispatcher->handle($request);
+    }
+
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::handle
+     */
+    public function testHandleCallResolve()
+    {
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->createMock(ResponseInterface::class);
+        /** @var MiddlewareInterface|MockObject $middleware */
+        $middleware = $this->createMock(MiddlewareInterface::class);
+
+        /** @var Dispatcher|MockObject $dispatcher */
+        $dispatcher = $this->getMockBuilder(Dispatcher::class)
+            ->setConstructorArgs([[MiddlewareInterface::class]])
+            ->setMethods(['resolveMiddleware'])
+            ->getMock();
+
+        $dispatcher->expects($this->once())
+            ->method('resolveMiddleware')
+            ->with(MiddlewareInterface::class)
+            ->willReturn($middleware);
+
+        $middleware->expects($this->once())
+            ->method('process')
+            ->with($request, $dispatcher)
+            ->willReturn($response);
+
+        $return = $dispatcher->handle($request);
+        $this->assertEquals($response, $return);
+    }
+
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::resolveMiddleware
+     * @covers \Engelsystem\Middleware\Dispatcher::setContainer
+     */
+    public function testResolveMiddleware()
+    {
+        /** @var Application|MockObject $container */
+        $container = $this->createMock(Application::class);
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->createMock(ResponseInterface::class);
+
+        $returnResponseMiddleware = new ReturnResponseMiddleware($response);
+
+        $container->expects($this->exactly(2))
+            ->method('has')
+            ->withConsecutive([ReturnResponseMiddleware::class], ['middleware'])
+            ->willReturnOnConsecutiveCalls(false, true);
+
+        $container->expects($this->once())
+            ->method('make')
+            ->with(ReturnResponseMiddleware::class)
+            ->willReturn($returnResponseMiddleware);
+
+        $container->expects($this->once())
+            ->method('get')
+            ->with('middleware')
+            ->willReturn($returnResponseMiddleware);
+
+        $dispatcher = new Dispatcher([ReturnResponseMiddleware::class]);
+        $dispatcher->setContainer($container);
+        $dispatcher->handle($request);
+
+        $dispatcher = new Dispatcher(['middleware'], $container);
+        $dispatcher->handle($request);
+    }
+
+    /**
+     * @covers \Engelsystem\Middleware\Dispatcher::resolveMiddleware
+     */
+    public function testResolveMiddlewareNoContainer()
+    {
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->createMock(ServerRequestInterface::class);
+
+        $this->expectException(InvalidArgumentException::class);
+
+        $dispatcher = new Dispatcher([ReturnResponseMiddleware::class]);
+        $dispatcher->handle($request);
+    }
+}
diff --git a/tests/Unit/Middleware/ExceptionHandlerTest.php b/tests/Unit/Middleware/ExceptionHandlerTest.php
new file mode 100644
index 00000000..6d2a20e6
--- /dev/null
+++ b/tests/Unit/Middleware/ExceptionHandlerTest.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware;
+
+use Engelsystem\Application;
+use Engelsystem\Exceptions\Handler;
+use Engelsystem\Http\Response;
+use Engelsystem\Middleware\ExceptionHandler;
+use Engelsystem\Test\Unit\Middleware\Stub\ExceptionMiddlewareHandler;
+use Engelsystem\Test\Unit\Middleware\Stub\ReturnResponseMiddlewareHandler;
+use Illuminate\Contracts\Container\Container as ContainerInterface;
+use PHPUnit\Framework\TestCase;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+class ExceptionHandlerTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Middleware\ExceptionHandler::__construct
+     * @covers \Engelsystem\Middleware\ExceptionHandler::process
+     */
+    public function testRegister()
+    {
+        /** @var MockObject|ContainerInterface $container */
+        $container = $this->getMockForAbstractClass(ContainerInterface::class);
+        /** @var MockObject|ServerRequestInterface $request */
+        $request = $this->getMockBuilder(ServerRequestInterface::class)->getMock();
+        /** @var MockObject|ResponseInterface $response */
+        $response = $this->getMockBuilder(Response::class)->getMock();
+        /** @var MockObject|Handler $errorHandler */
+        $errorHandler = $this->getMockBuilder(Handler::class)->getMock();
+        $returnResponseHandler = new ReturnResponseMiddlewareHandler($response);
+        $throwExceptionHandler = new ExceptionMiddlewareHandler();
+
+        Application::setInstance($container);
+
+        $container->expects($this->exactly(2))
+            ->method('get')
+            ->withConsecutive(['error.handler'], ['psr7.response'])
+            ->willReturnOnConsecutiveCalls($errorHandler, $response);
+
+        $response->expects($this->once())
+            ->method('withContent')
+            ->willReturn($response);
+        $response->expects($this->once())
+            ->method('withStatus')
+            ->with(500)
+            ->willReturn($response);
+
+        $handler = new ExceptionHandler($container);
+        $return = $handler->process($request, $returnResponseHandler);
+        $this->assertEquals($response, $return);
+
+        $return = $handler->process($request, $throwExceptionHandler);
+        $this->assertEquals($response, $return);
+    }
+}
diff --git a/tests/Unit/Middleware/LegacyMiddlewareTest.php b/tests/Unit/Middleware/LegacyMiddlewareTest.php
new file mode 100644
index 00000000..34e60b60
--- /dev/null
+++ b/tests/Unit/Middleware/LegacyMiddlewareTest.php
@@ -0,0 +1,85 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware;
+
+use Engelsystem\Http\Request;
+use Engelsystem\Middleware\LegacyMiddleware;
+use PHPUnit\Framework\TestCase;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Psr\Container\ContainerInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Symfony\Component\HttpFoundation\ParameterBag;
+
+class LegacyMiddlewareTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Middleware\LegacyMiddleware::__construct
+     * @covers \Engelsystem\Middleware\LegacyMiddleware::process
+     */
+    public function testRegister()
+    {
+        /** @var ContainerInterface|MockObject $container */
+        $container = $this->getMockForAbstractClass(ContainerInterface::class);
+        /** @var LegacyMiddleware|MockObject $middleware */
+        $middleware = $this->getMockBuilder(LegacyMiddleware::class)
+            ->setConstructorArgs([$container])
+            ->setMethods(['loadPage', 'renderPage'])
+            ->getMock();
+        /** @var Request|MockObject $defaultRequest */
+        $defaultRequest = $this->createMock(Request::class);
+        /** @var ParameterBag|MockObject $parameters */
+        $parameters = $this->createMock(ParameterBag::class);
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->getMockForAbstractClass(ResponseInterface::class);
+        /** @var RequestHandlerInterface|MockObject $handler */
+        $handler = $this->getMockForAbstractClass(RequestHandlerInterface::class);
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->getMockForAbstractClass(ServerRequestInterface::class);
+
+        $middleware->expects($this->exactly(2))
+            ->method('loadPage')
+            ->withConsecutive(['user_worklog'], ['login'])
+            ->willReturnOnConsecutiveCalls(
+                ['title', 'content'],
+                ['title2', 'content2']
+            );
+
+        $middleware->expects($this->exactly(2))
+            ->method('renderPage')
+            ->withConsecutive(
+                ['user_worklog', 'title', 'content'],
+                ['login', 'title2', 'content2']
+            )
+            ->willReturn($response);
+
+        $container->expects($this->atLeastOnce())
+            ->method('get')
+            ->with('request')
+            ->willReturn($defaultRequest);
+
+        $defaultRequest->query = $parameters;
+        $defaultRequest->expects($this->once())
+            ->method('path')
+            ->willReturn('user-worklog');
+
+        $parameters->expects($this->exactly(3))
+            ->method('get')
+            ->with('p')
+            ->willReturnOnConsecutiveCalls(
+                null,
+                'foo',
+                '/'
+            );
+
+        $handler->expects($this->once())
+            ->method('handle')
+            ->with($request)
+            ->willReturn($response);
+
+        $middleware->process($request, $handler);
+        $middleware->process($request, $handler);
+        $middleware->process($request, $handler);
+    }
+}
diff --git a/tests/Unit/Middleware/NotFoundResponseTest.php b/tests/Unit/Middleware/NotFoundResponseTest.php
new file mode 100644
index 00000000..9279e81d
--- /dev/null
+++ b/tests/Unit/Middleware/NotFoundResponseTest.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware;
+
+use Engelsystem\Middleware\NotFoundResponse;
+use PHPUnit\Framework\TestCase;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+class NotFoundResponseTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Middleware\NotFoundResponse::process
+     */
+    public function testRegister()
+    {
+        /** @var NotFoundResponse|MockObject $middleware */
+        $middleware = $this->getMockBuilder(NotFoundResponse::class)
+            ->setMethods(['renderPage'])
+            ->getMock();
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->getMockForAbstractClass(ResponseInterface::class);
+        /** @var RequestHandlerInterface|MockObject $handler */
+        $handler = $this->getMockForAbstractClass(RequestHandlerInterface::class);
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->getMockForAbstractClass(ServerRequestInterface::class);
+
+        $middleware->expects($this->once())
+            ->method('renderPage')
+            ->willReturn($response);
+
+        $handler->expects($this->never())
+            ->method('handle');
+
+        $middleware->process($request, $handler);
+    }
+}
diff --git a/tests/Unit/Middleware/SendResponseHandlerTest.php b/tests/Unit/Middleware/SendResponseHandlerTest.php
new file mode 100644
index 00000000..7431299e
--- /dev/null
+++ b/tests/Unit/Middleware/SendResponseHandlerTest.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware;
+
+use Engelsystem\Middleware\SendResponseHandler;
+use PHPUnit\Framework\TestCase;
+use PHPUnit_Framework_MockObject_MockObject as MockObject;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+class SendResponseHandlerTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Middleware\SendResponseHandler::process
+     */
+    public function testRegister()
+    {
+        /** @var SendResponseHandler|MockObject $middleware */
+        $middleware = $this->getMockBuilder(SendResponseHandler::class)
+            ->setMethods(['headersSent', 'sendHeader'])
+            ->getMock();
+        /** @var ServerRequestInterface|MockObject $request */
+        $request = $this->getMockForAbstractClass(ServerRequestInterface::class);
+        /** @var ResponseInterface|MockObject $response */
+        $response = $this->getMockForAbstractClass(ResponseInterface::class);
+        /** @var RequestHandlerInterface|MockObject $handler */
+        $handler = $this->getMockForAbstractClass(RequestHandlerInterface::class);
+
+        $middleware->expects($this->atLeastOnce())
+            ->method('headersSent')
+            ->willReturnOnConsecutiveCalls(true, false);
+
+        $middleware->expects($this->exactly(4))
+            ->method('sendHeader')
+            ->withConsecutive(
+                ['HTTP/0.7 505 Something went wrong!', true, 505],
+                ['Foo: bar', false],
+                ['lorem: ipsum', false],
+                ['lorem: dolor', false]
+            );
+
+        $handler->expects($this->exactly(2))
+            ->method('handle')
+            ->with($request)
+            ->willReturn($response);
+
+        $response->expects($this->exactly(2))
+            ->method('getBody')
+            ->willReturn('Lorem Ipsum!');
+
+        $response->expects($this->atLeastOnce())
+            ->method('getProtocolVersion')
+            ->willReturn('0.7');
+
+        $response->expects($this->atLeastOnce())
+            ->method('getStatusCode')
+            ->willReturn(505);
+
+        $response->expects($this->once())
+            ->method('getReasonPhrase')
+            ->willReturn('Something went wrong!');
+        $response->expects($this->once())
+            ->method('getHeaders')
+            ->willReturn(['Foo' => ['bar'], 'lorem' => ['ipsum', 'dolor']]);
+
+        $this->expectOutputString('Lorem Ipsum!Lorem Ipsum!');
+        $middleware->process($request, $handler);
+        $middleware->process($request, $handler);
+    }
+}
diff --git a/tests/Unit/Middleware/Stub/ExceptionMiddlewareHandler.php b/tests/Unit/Middleware/Stub/ExceptionMiddlewareHandler.php
new file mode 100644
index 00000000..5e374bea
--- /dev/null
+++ b/tests/Unit/Middleware/Stub/ExceptionMiddlewareHandler.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware\Stub;
+
+use Exception;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+class ExceptionMiddlewareHandler implements RequestHandlerInterface
+{
+    /**
+     * Throws an exception
+     *
+     * @param ServerRequestInterface $request
+     * @return ResponseInterface
+     * @throws Exception
+     */
+    public function handle(ServerRequestInterface $request): ResponseInterface
+    {
+        throw new Exception('Boooom!');
+    }
+}
diff --git a/tests/Unit/Middleware/Stub/NotARealMiddleware.php b/tests/Unit/Middleware/Stub/NotARealMiddleware.php
new file mode 100644
index 00000000..017389da
--- /dev/null
+++ b/tests/Unit/Middleware/Stub/NotARealMiddleware.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware\Stub;
+
+class NotARealMiddleware
+{
+    // I'm not a middleware!
+}
diff --git a/tests/Unit/Middleware/Stub/ReturnResponseMiddleware.php b/tests/Unit/Middleware/Stub/ReturnResponseMiddleware.php
new file mode 100644
index 00000000..7c241353
--- /dev/null
+++ b/tests/Unit/Middleware/Stub/ReturnResponseMiddleware.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware\Stub;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+class ReturnResponseMiddleware implements MiddlewareInterface
+{
+    /** @var ResponseInterface */
+    protected $response;
+
+    public function __construct(ResponseInterface $response)
+    {
+        $this->response = $response;
+    }
+
+    /**
+     * Process an incoming server request and return a response, optionally delegating
+     * response creation to a handler.
+     *
+     * Could be used to group middleware
+     *
+     * @param ServerRequestInterface  $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    public function process(
+        ServerRequestInterface $request,
+        RequestHandlerInterface $handler
+    ): ResponseInterface {
+        return $this->response;
+    }
+}
diff --git a/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php b/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php
new file mode 100644
index 00000000..323e07b4
--- /dev/null
+++ b/tests/Unit/Middleware/Stub/ReturnResponseMiddlewareHandler.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Middleware\Stub;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+class ReturnResponseMiddlewareHandler implements RequestHandlerInterface
+{
+    /** @var ResponseInterface */
+    protected $response;
+
+    public function __construct(ResponseInterface $response)
+    {
+        $this->response = $response;
+    }
+
+    /**
+     * Returns a given response
+     *
+     * @param ServerRequestInterface $request
+     * @return ResponseInterface
+     * @throws \Exception
+     */
+    public function handle(ServerRequestInterface $request): ResponseInterface
+    {
+        return $this->response;
+    }
+}